C++ definition

Abstract base module for MAC relay unit implementations (Ethernet switches). Provides core functionality for MAC address learning and frame forwarding in bridged Ethernet networks. Contains functionality for maintaining a MAC address table that maps addresses to ports, learning addresses from incoming frames, and forwarding frames to appropriate interfaces. It is able to handle unicast, multicast, and broadcast traffic according to standard Ethernet switching rules.

<b>See also:</b> IMacForwardingTable

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Known subclasses

Name	Type	Description
Ieee8021dRelay	simple module	Forwards frames (~EtherFrame) based on their destination MAC addresses to appropriate ports.
MacRelayUnit	simple module	Implements Ethernet switch functionality by relaying frames between different ports based on destination MAC addresses. Maintains a MAC address table that maps addresses to ports, learns addresses from incoming frames, and forwards frames appropriately. Handles unicast, multicast, and broadcast traffic according to standard Ethernet switching rules, with support for VLANs.

Extends

Name	Type	Description
SimpleModule	simple module	Base module for all INET simple modules.

Parameters

Name	Type	Default value	Description
displayStringTextFormat	string	"proc: %p\ndisc: %d"	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
macTableModule	string
interfaceTableModule	string

Properties

Name	Value	Description
class	MacRelayUnitBase
display	i=block/switch

Gates

Name	Direction	Size	Description
lowerLayerIn	input
lowerLayerOut	output
upperLayerIn	input
upperLayerOut	output

Signals

Name	Type	Unit	Description
packetReceivedFromUpper	inet::Packet
packetReceivedFromLower	inet::Packet
packetDropped	inet::Packet
packetSentToLower	inet::Packet

Statistics

Name	Title	Source	Record	Unit	Interpolation Mode	Description
packetDropped	packets dropped		count, sum(packetBytes), vector(packetBytes)		none

Source code

//
// Abstract base module for MAC relay unit implementations (Ethernet switches).
// Provides core functionality for MAC address learning and frame forwarding in
// bridged Ethernet networks. Contains functionality for maintaining a MAC
// address table that maps addresses to ports, learning addresses from incoming
// frames, and forwarding frames to appropriate interfaces. It is able to handle
// unicast, multicast, and broadcast traffic according to standard Ethernet
// switching rules.
//
// @see IMacForwardingTable
//
simple MacRelayUnitBase extends SimpleModule
{
    parameters:
        @class(MacRelayUnitBase);
        string macTableModule;
        string interfaceTableModule;
        displayStringTextFormat = default("proc: %p\ndisc: %d");
        @display("i=block/switch");
        @signal[packetSentToLower](type=inet::Packet);
        @signal[packetReceivedFromUpper](type=inet::Packet);
        @signal[packetReceivedFromLower](type=inet::Packet);
        @signal[packetDropped](type=inet::Packet);
        @statistic[packetDropped](title="packets dropped"; record=count,sum(packetBytes),vector(packetBytes); interpolationmode=none);
    gates:
        input lowerLayerIn;
        output lowerLayerOut;
        input upperLayerIn;
        output upperLayerOut;
}

File: src/inet/linklayer/base/MacRelayUnitBase.ned

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